<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>练习</title>
</head>
<body>
<script>
    function f1() {
        console.log('haha')
    }
    f1();
    function f2(name,age) {
        console.log(name+":"+age)
    }
    f2("jiaojiao",18);
    function f3() {
        return "I am zhoujiao."
    }
    let result = f3();
    console.log(result)
    function f4(x, y) {
        return x*y;
    }
    let res = f4(10,5);
    console.log(res)
</script>
</body>
</html>